Archived posting to the Leica Users Group, 2006/12/07

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] Math Question
From: philippe.orlent at pandora.be (Philippe Orlent)
Date: Thu Dec 7 14:20:25 2006
References: <7.0.1.0.2.20061206152403.027b4508@infoave.net> <45772DC5.3040508@mcclary.net> <23C63C29-1E1D-43D6-A946-45C580F2326E@pandora.be> <4577300C.7000108@mcclary.net> <F04C2DAF-1C77-416C-ACC7-72A31E62F94F@pandora.be> <p0623090dc19e3edfaa21@[10.1.16.133]>

Thanks Henning,
I knew there was something wrong about my reasoning, however logic it  
seemed.
Philippe



Op 7-dec-06, om 23:02 heeft Henning Wulff het volgende geschreven:

> At 10:29 PM +0100 12/6/06, Philippe Orlent wrote:
>> I was just remembering my ISO scale on the back of my MP:  
>> 50-100-200-400-800- etc.
>>
>> But the zones in between are divided in 3 parts.
>>
>> So between 50-100: 50/3=16,7
>> Between: 100-200: 100/3=33,33, which would put 160 at 100 and 2/3ds
>> Two full stops under brings us at
>> 400 and 2/3ds
>> Which is 400 + (800-400)x2/3= 666,7
>>
>> I may be wrong, but it looks like Leica logics to me.
>> :-)
>> Philippe
>>
>
> ISO is not continuous. It's only defined for the discrete  
> progression (from 100 to 3200) for 100, 125, 160, 200, 250, 320,  
> 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200.
>
> No numbers in between, ie, there is not 'ISO 300' or 'ISO 666'.
>
> -- 
>    *            Henning J. Wulff
>   /|\      Wulff Photography & Design
>  /###\   mailto:henningw@archiphoto.com
>  |[ ]|     http://www.archiphoto.com
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


In reply to: Message from images at InfoAve.Net (Tina Manley) ([Leica] Math Question)
Message from harrison at mcclary.net (Harrison McClary) ([Leica] Math Question)
Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Math Question)
Message from harrison at mcclary.net (Harrison McClary) ([Leica] Math Question)
Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Math Question)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] Math Question)